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Starting at $4.95, AutoBuffy stocks 1 engine crankcase breather hose grommets from Standard Ignition. This rubber grommet seals the breather hose where it passes through the valve cover or engine block, preventing unmetered air leaks into the crankcase ventilation system. When it fails, the PCV system loses its vacuum seal, causing rough idle, oil leaks, and elevated emissions.
The main decision is material quality and fitment precision. OEM-spec grommets match the original wall thickness, inner diameter, and durometer rating engineered for your engine's crankcase pressure range. Aftermarket options vary widely, so matching the grommet's inner and outer diameter to your breather hose and port is critical to maintaining an airtight seal.
| Option | Best for | What you get |
|---|---|---|
| OEM-equivalent (exact match) | Owners who want a direct, no-adjustment replacement | Precise dimensions, correct durometer rubber, guaranteed port and hose fitment |
| Premium aftermarket (e.g., silicone) | High-heat applications or engines with elevated crankcase temps | Higher heat and oil resistance than standard rubber, longer service life in demanding conditions |
| Standard aftermarket (EPDM rubber) | Budget-conscious repair or second vehicles | Functional seal at lower cost; verify inner/outer diameter matches before ordering |
| Universal grommet (cut-to-fit) | Custom engine builds or discontinued OEM applications | Flexible fitment option, requires trimming to correct ID/OD; not ideal for stock applications |
Remove the breather hose from the valve cover port, then use a flathead screwdriver or trim tool to carefully pry out the old grommet — avoid gouging the port bore. Clean the bore thoroughly, press the new grommet in by hand until it seats flush and evenly, then reattach the breather hose. Start the engine and confirm no oil seepage or vacuum leak noise at the repair site.